这段代码中的错误是什么？视觉工作室的错误是“预期的 [英] what is the error in this code? the Error in visual studio was " } expected "

问题描述

 命名空间 timer33 
 {
  / //   <  摘要 >  
   ///  交互逻辑for MainWindow.xaml 
   ///   < ;   / summary  >  
   public   partial   class  MainWindow：Window 
 {
  public  MainWindow（）
 {
 InitializeComponent（）; 
} 
 
  public   static  类 DelayedExecutionService 
 {
  public   static   void  DelayedExecute（操作操作， int  delay =  3  ）
 {
  var  dispatcherTimer =  new  System.Windows.Threading.DispatcherTimer（ ）; 
 
 EventHandler handler =  null ; 
 handler =（sender，e）= >  
 {
  //  停止计时器，使其不会每隔X秒执行一次 
  //  并且还避免将处理程序保留在内存中。 
 dispatcherTimer.Tick  -  = handler; 
 dispatcherTimer.Stop（）; 
 
  //  执行操作。 
 action（）; 
}; 
 
 dispatcherTimer.Tick + = handler; 
 dispatcherTimer.Interval = TimeSpan.FromSeconds（delay）; 
  private   void  button1_Click（ object  sender，RoutedEventArgs e）
 {
  var  dispatcherTimer =  new  System.Windows .Threading.DispatcherTimer（）; 
 dispatcherTimer.Start（）; 
 DelayedExecutionService.DelayedExecute（（）= >  
 MessageBox.Show（  Hello！））; 
} 
} 
 
} 
} 

解决方案

< blockquote>简单：你不能嵌套方法：你的button1_Click处理程序在你的DelayedExecute方法体内，这是不允许的。

namespace timer33
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
       
       public static class DelayedExecutionService
       {
           public static void DelayedExecute(Action action, int delay = 3)
           {
               var dispatcherTimer = new System.Windows.Threading.DispatcherTimer();

               EventHandler handler = null;
               handler = (sender, e) =>
              {
                  // Stop the timer so it won't keep executing every X seconds
                  // and also avoid keeping the handler in memory.
                  dispatcherTimer.Tick -= handler;
                  dispatcherTimer.Stop();

                  // Perform the action.
                  action();
              };

               dispatcherTimer.Tick += handler;
               dispatcherTimer.Interval = TimeSpan.FromSeconds(delay);
               private void button1_Click(object sender, RoutedEventArgs e)
             {
              var dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
              dispatcherTimer.Start();
              DelayedExecutionService.DelayedExecute(() => 
                  MessageBox.Show("Hello!"));
             }
       }
               
      }
    }

解决方案

Simple: you can't nest methods: Your button1_Click handler is inside the body of your DelayedExecute method, which is not allowed.

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